trait ChildProcess extends Object with IEventEmitter
The child_process module provides the ability to spawn child processes in a manner that is similar, but not identical, to popen(3). This capability is primarily provided by the child_process.spawn() function.
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- @RawJSType() @native()
- See also
https://nodejs.org/api/child_process.html
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- def addListener(eventName: String, listener: Function): ChildProcess.this.type
Alias for emitter.on(eventName, listener).
Alias for emitter.on(eventName, listener).
- Definition Classes
- IEventEmitter
emitter.addListener(eventName, listener)
- See also
on()
Example: - final def asInstanceOf[T0]: T0
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- val connected: Boolean
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- IEventEmitter
- def emit(name: String, args: Any*): Boolean
Synchronously calls each of the listeners registered for the event named eventName, in the order they were registered, passing the supplied arguments to each.
Synchronously calls each of the listeners registered for the event named eventName, in the order they were registered, passing the supplied arguments to each.
Returns true if the event had listeners, false otherwise.
- name
the event name
- args
the event arguments
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- IEventEmitter
emitter.emit(name[, arg1][, arg2][, ...])
Example: - final def eq(arg0: AnyRef): Boolean
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- def eventNames(): Array[String]
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- IEventEmitter
- final def getClass(): Class[_ <: AnyRef]
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- def getMaxListeners(): Int
Returns the current max listener value for the EventEmitter which is either set by emitter.setMaxListeners(n) or defaults to EventEmitter.defaultMaxListeners.
Returns the current max listener value for the EventEmitter which is either set by emitter.setMaxListeners(n) or defaults to EventEmitter.defaultMaxListeners.
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- IEventEmitter
emitter.getMaxListeners()
- See also
setMaxListeners()
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- def isPrototypeOf(v: Object): Boolean
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- def kill(signal: UndefOr[KillSignal] = js.native): Unit
- val killed: Boolean
- def listenerCount(eventName: String): Int
Returns the number of listeners listening to the event named eventName.
Returns the number of listeners listening to the event named eventName.
- Definition Classes
- IEventEmitter
emitter.listenerCount(eventName)
Example: - def listeners(eventName: String): Array[Function]
Returns a copy of the array of listeners for the event named eventName.
Returns a copy of the array of listeners for the event named eventName.
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- IEventEmitter
emitter.listeners(eventName)
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- final def notify(): Unit
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- final def notifyAll(): Unit
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- def on(eventName: String, listener: Function): ChildProcess.this.type
Adds the listener function to the end of the listeners array for the event named eventName.
Adds the listener function to the end of the listeners array for the event named eventName. No checks are made to see if the listener has already been added. Multiple calls passing the same combination of eventName and listener will result in the listener being added, and called, multiple times.
Returns a reference to the EventEmitter so calls can be chained.
- Definition Classes
- IEventEmitter
emitter.on(eventName, listener)
Example: - def once(eventName: String, listener: Function): ChildProcess.this.type
Adds a one time listener function for the event named eventName.
Adds a one time listener function for the event named eventName. This listener is invoked only the next time eventName is triggered, after which it is removed.
- Definition Classes
- IEventEmitter
emitter.once(eventName, listener)
Example: - val pid: Int
- def prependListener(eventName: String, listener: Function): ChildProcess.this.type
- Definition Classes
- IEventEmitter
- def prependOnceListener(eventName: String, listener: Function): ChildProcess.this.type
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- IEventEmitter
- def propertyIsEnumerable(v: String): Boolean
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- Object
- def ref(): Unit
- def removeAllListeners(eventName: String = js.native): ChildProcess.this.type
Removes all listeners, or those of the specified eventName.
Removes all listeners, or those of the specified eventName.
Note that it is bad practice to remove listeners added elsewhere in the code, particularly when the EventEmitter instance was created by some other component or module (e.g. sockets or file streams).
Returns a reference to the EventEmitter so calls can be chained.
- Definition Classes
- IEventEmitter
emitter.removeAllListeners([eventName])
Example: - def removeListener(eventName: String, listener: Function): ChildProcess.this.type
Removes the specified listener from the listener array for the event named eventName.
Removes the specified listener from the listener array for the event named eventName. removeListener will remove, at most, one instance of a listener from the listener array. If any single listener has been added multiple times to the listener array for the specified eventName, then removeListener must be called multiple times to remove each instance.
Note that once an event has been emitted, all listeners attached to it at the time of emitting will be called in order. This implies that any removeListener() or removeAllListeners() calls after emitting and before the last listener finishes execution will not remove them from emit() in progress. Subsequent events will behave as expected.
- Definition Classes
- IEventEmitter
emitter.removeListener(eventName, listener)
Example: - def setMaxListeners(n: Int): ChildProcess.this.type
By default EventEmitters will print a warning if more than 10 listeners are added for a particular event.
By default EventEmitters will print a warning if more than 10 listeners are added for a particular event. This is a useful default that helps finding memory leaks. Obviously, not all events should be limited to just 10 listeners. The emitter.setMaxListeners() method allows the limit to be modified for this specific EventEmitter instance. The value can be set to Infinity (or 0) for to indicate an unlimited number of listeners.
Returns a reference to the EventEmitter so calls can be chained.
- Definition Classes
- IEventEmitter
emitter.setMaxListeners(n)
Example: - val stderr: IReadable
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- val usingDomains: Boolean
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- def valueOf(): Any
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- final def wait(arg0: Long, arg1: Int): Unit
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- final def wait(arg0: Long): Unit
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- final def wait(): Unit
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